Norsjø is a lake in the municipalities of Skien, Nome, and Midt-Telemark in Telemark county, Norway.

The 58-square-kilometre (22 sq mi) lake sits at an elevation of 15 m (49 ft) above sea level.

Most rivers in Telemark flow into the lake Norsjø including the rivers Bøelva, Sauarelva, and Eidselva.

Norsjø is a source of drinking water for Skien Municipality.

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